ERROR -- Incorrect number of interface nodes for X_U1

[mohd113]

I am trying to simulate a memristor with SUBCKT code (memristor component is named U1)

* Ron, Roff - Resistance in ON / OFF States
* Rinit - Resistance at T=0
* D - Width of the thin film
* uv - Migration coefficient
* p - Parameter of the WINDOW-function
* for modeling nonlinear boundary conditions
* x - W/D Ratio, W is the actual width
* of the doped area (from 0 to D)
*
.SUBCKT memristor Plus Minus PARAMS:
+ Ron=100 Roff=16K Rinit=11K D=10N uv=10F p=10

* DIFFERENTIAL EQUATION MODELING *

Gx 0 x value={ I(Emem)*uv*Ron/D^2*f(V(x),p)}
Cx x 0 1 IC={(Roff-Rinit)/(Roff-Ron)}
Raux x 0 1T
* RESISTIVE PORT OF THE MEMRISTOR *

Emem plus aux value={-I(Emem)*V(x)*(Roff-Ron)}
Roff aux minus {Roff}

*Flux computation*

Eflux flux 0 value={SDT(V(plus,minus))}

*Charge computation*

Echarge charge 0 value={SDT(I(Emem))}

* WINDOW FUNCTIONS
* FOR NONLINEAR DRIFT MODELING *

*window function, according to Joglekar
.func f(x,p)={1-(2*x-1)^(2*p)}
*proposed window function
;.func f(x,i,p)={1-(x-stp(-i))^(2*p)}
.ENDS memristor

my circuit code that is generated by Orcad for simulataion is

R_R1 -1 0 100 TC=0,0
V_V1 -1 0 SIN 0V 0.1V 0.56Hz 0 0 0
X_U1 -1 0 MEMRISTOR PARAMS: RON=100 ROFF=16K RINIT=11K D=10N UV=10F P=10
**** RESUMING trail1.cir ****
.END

then it give me the error
ERROR -- Incorrect number of interface nodes for X_U1

What can I do to solve this problem?
Thanks

 

[FvM]

Is -1 a legal node name?

 

[mohd113]

Is -1 a legal node name?

yes it is and I changed it to 1 and also the same error, may be u could try to simulate the code

 

[FvM]

There's apparently no syntax error. The simulation runs flawlessly in LTspice.

 

[mohd113]

There's apparently no syntax error. The simulation runs flawlessly in LTspice.

So do you know what is the problem. Secondly, could you tell me how you simulated it on LTSpice Thanks

 

[FvM]

So do you know what is the problem. Secondly, could you tell me how you simulated it on LTSpice

I don't recognize a problem.

You can add a .tran simulation command and open the *.cir file in LTSpice. Refer to ´the help file for details.
I didn't yet check if the behavioral expressions are completely understood by LTSpice but there are at least equivalent means available.